is an annual herb, 20-40cm in height, occurring in paddies, marshes,
or swamps; the radical leaves are heart-shaped, thick, glossy, and
long petioles, its leaf blades measuring 10-20cm in length. With
stem leaves, petioles are short. Racemes grow taller than the levels
of the leaves and bear many bluish-purple flowers, 2.5-3cm in
diameter, in racemose ways. Bloom time: September-October.